delegate
Advanced tools
Package description
The 'delegate' npm package is designed to provide a straightforward and efficient way to manage and delegate event handlers in JavaScript. It allows developers to attach a single event listener to a parent element that can handle events from child elements, matching a specific selector. This approach is particularly useful for handling events on dynamically added elements or for reducing the number of event listeners in an application, thereby improving performance.
Event delegation
This feature allows you to attach an event listener to a parent element (in this case, a 'ul' with id 'myList') that listens for clicks on its child 'li' elements. When a 'li' element is clicked, the provided function is executed. This is useful for handling events on elements that may not exist at the time the script runs or for minimizing the number of event listeners in your application.
document.delegate('ul#myList', 'click', 'li', function(event) {
console.log('List item clicked:', this);
});Similar to 'delegate', 'dom-delegate' offers event delegation functionalities, allowing events to be bound to a parent element and triggered by child elements. The main difference lies in the API and additional features that 'dom-delegate' might offer, such as more advanced event filtering or handling capabilities.
This package provides functionality similar to 'delegate' by enabling event delegation in JavaScript applications. It allows for a more modular and efficient way to handle events, especially in dynamic content scenarios. The comparison mainly revolves around the specific API design and performance optimizations each package might offer.
Readme
Lightweight event delegation.
You can get it on npm.
npm install delegate --save
If you're not into package management, just download a ZIP file.
var delegate = require('delegate');
<script src="dist/delegate.js"></script>
document)delegate('.btn', 'click', function(e) {
console.log(e.delegateTarget);
}, false);
delegate(document.body, '.btn', 'click', function(e) {
console.log(e.delegateTarget);
}, false);
delegate('.container', '.btn', 'click', function(e) {
console.log(e.delegateTarget);
}, false);
delegate(document.querySelectorAll('.container'), '.btn', 'click', function(e) {
console.log(e.delegateTarget);
}, false);
var delegation = delegate(document.body, '.btn', 'click', function(e) {
console.log(e.delegateTarget);
}, false);
delegation.destroy();
Note: selectors are always treated as multiple elements, even if one or none are matched. delegate() will return an array.
var delegations = delegate('.container', '.btn', 'click', function(e) {
console.log(e.delegateTarget);
}, false);
delegations.forEach(function (delegation) {
delegation.destroy();
});
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| Latest ✔ | Latest ✔ | Latest ✔ | 9+ ✔ | Latest ✔ | Latest ✔ |
MIT License © Zeno Rocha
FAQs
Lightweight event delegation
The npm package delegate receives a total of 1,265,437 weekly downloads. As such, delegate popularity was classified as popular.
We found that delegate demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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Research
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